Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 15: Femtosecond Spectroscopy IV

MO 15.3: Talk

Wednesday, March 20, 2013, 11:45–12:00, F 102

Ultrafast X-Ray Diffraction Experiments on Crystalline DIABN via a Laser Driven Plasma Source — •Florian Trommer, Stefan M. Hofmann, Florian J. Lederer, Julian Schauseil, and Wolfgang Zinth — Chair for BioMolecular Optics, Ludwig-Maximilians-University Munich, Oettingenstr. 67, 80538 Munich, Germany

Information on the ultrafast behavior of molecules is most often obtained via spectroscopy. On the other hand, the structure of these molecules has been accessible through X-ray diffraction. Since the introduction of laser driven plasma sources, structure dynamics can also be studied on the femtosecond timescale. In our group we are currently implementing a Pump-Probe-experiment with visible Pump and X-ray Probe.

By using gallium arsenide we could characterise the X-ray source itself and develop techniques for optaining temporal and spatial overlap. The crucial issue in these measurements was to improve experimental precision and to find and eliminate sources of noise in order to approach the shot-noise limit. Finally the optimized setup is used to investigate 4-(Diisopropylamino)benzonitrile (DIABN) crystals[1].

This work is supported by the DFG Cluster of Excellence: Munich-Centre for Advanced Photonics (MAP).

[1] M. Braun et al., Applied Physics A, 96(1) 107 (2009)